Imuran over Remicade

So after my last sigmoidoscopy my doctor decided to try and put me on Remicade. My doctor's office called me with my benefits for Remicade, and apparently every time I went to get an infusion it was going to be about $738 out of my pocket. So I am not going to be able to afford it. Now my doctor has chosen to put me on Imuran. Can anyone give me their opinions and/or advice about Imuran.